Constant proportioning gas-mixing apparatus



March 31, 1931. w. THOMAS Y 1,798,232

CONSTANT PROPORTIONING GAS MIXINQ APPARATUS Filed May 29, '1928 Fuel M/xfure Base Gas or Air //7.

FIG. 1;

FIG. 2.

INVENTOR 11W. Thomas ATTORNEY Patented Mar. 31, 1931 UNITED STATES PATENT OFFICE ROSSWELL W. THOMAS, OF BAR-TLESVILLE, OKLAHOMA, ASSIGNOR TO PHILLIPS PE- TROLEUM COMPANY, OF BARTLESVILLE, OKLAHOMA, A CORPORATION OF DELA- WARE CONSTANT PROPORTIONING GAS-MIXING APPARATUS Application filed May 29, 1928.

This invention relates to improvements in constant proportioning mixer mechanism for use as a gas-air mixer for burners, or for carburating or diluting gases of any kind.

' One of the objects of the invention is to provide an apparatus capable of handling a plurality of gases at variable rates through changeable orifices, but at fixed diiferentia-ls, and adapted to automatically maintain the mixture in pre-determined (variable at the will of the operator) proportions, regardless of system pressure or rate of flow.

Another object is to furnish an apparatus of this character with valve means actuated by diflerences in pressure of'the gases handled; a part of said valve means being manually adjustable to facilitate accurate proportioning of the materials handled.

With the above objects outlined and with further objects in view which will appear as the description proceeds, the invention includes the novel features hereinafter described in detail in connection with the accompanied drawing, and more especially pointed out in the claims.

Referring to the drawing: I

Fig. 1 is a top plan view of a preferred embodiment of the invention.

Fig. 2 is a vertical longitudinal section taken on line 22 of Fig. 1.

In the drawing 1 designates a casing which may be formed of a. base section 2 and a cover section 3 detachedly connected together by any suitable means.

A pipe 4'is employed to lead air or any other suitable gas for the mixture into the chamber 5 of the casing and this pipe discharges into a housing 6, which is connected to the base 2 and communicates with the chamber 5.

A similar housing 7 is connected to the base and also'to a mixture outlet 8, functioning to discharge the gases mixed in the apparatus to any suitable point of consumption.

'A thirdihousing 9, similar to the housings 6 and 7, is connected to the base 2 and it will be observed that the housings 6 and 9 are arranged parallel to the housing 7, but are of less length than the latter, for a. purpose hereinafter described.

Serial No. 281,448.

A fuel gas inlet conduit 10- leads to the housing 9 and a valve structure 11 is interposed in this conduit. Said valve structure includes avalve head 12 designed to control orifices 13 in the valve structure, and the head.

the valve head 12. so as to control the orifices For the purpose of steadying the valve steni, the latter is provided intermediate its ends with a cross slot 19 which receives the curved ends 20 of levers 21 which are pivotally mounted on shafts 22 and are provided with weights 23, functioning to normally shift the valve into closed position. The shafts on which the levers are mounted are arranged in the valve casing.

A secondvalve 24 is arranged within the casing 1 and this valve consists of an inverted cup having a marginal flange 25 surrounding its lower edge, the flange being slidably arranged on the base 2. This valve, as best shown in Figure 1, :covers the housings-6, 7 and 9 and it may be shifted to control the quantities of gases or mixed gases passing through said housings. This is accomplished by apressure operated valve structure 26, which includes a diaphragm 27. The latter is connected to the valve 24 by a rod 28.

The pressure of the line 8 is transmitted to a chamber 29 of the valve structure 26 by means of a pipe 30, and a second chamber 31 of the valve structure 26 arranged at the opposite side of the diaphragm, communicates with the chamber 5 by way of conduit 32.

From Fig. 2 it will be observed thatthe conduit 4 communicates with the chamber 5 through a passageway 33 and consequently the pressure in the conduit 4 is commumcated to one side cf the diaphragm 27 while the pressure of conduit 8 is communicated to the opposite side of the diaphragm. It is apparent therefore, that differences in pressures in the conduits 4 and 8 will result in the shifting of the valve 24 to vary the quantities of the gases fed into the valve 24 from the conduits 4t and 10.

The outlet housing 7 as well as the housing 9 may be also controlled manually for regulating the quantity of mixture fed to the out-v let pipe 8, and for this purpose one end of the valve 24 is provided with a horizontally disposed slot 34 that is cut in a metal strip 35 secured to the valve 24. A screw 36 extends through one wall of the housing 1 and has a threaded connection with the latter and the inner end of this screw has a swivel head 37 on which the valve 24 slides when it is shifted back and forth by the valve structure 26.

It will be apparent that when the screw 36 is moved inwardly oroutwardly, the valve 24 will be shifted transversely and after an adjustment has \been made the screw can be locked into position by a lock nut 38.

In using this device, assuming that it is employed as a mixing apparatus, fuel may be fed in through the pipe 10 and at the same time base gas or air will flow through pipe 4. The mixed gases will exit through pipe 8.

The difference in pressures in the conduits 4 and 8 will result in the displacement of the diaphragm 27 and this will cause the rod 28 to shift the valve 24 to regulate the proportion of fuel gas to air. At the same time the differences in pressure in the conduit 8 and conduit 10 will cause displacement of the diaphragm 15 and in this Way the valve 12 will be shifted to feed the proper quantity of fuel I to the mixing apparatus.

As the valve 24 issubjectedto uniform pressures on its opposite sides by means of the passageway 33, it will be observed that it is unnecessary'to employ any special means for forcing the valve-24 against its seat.

The means connecting the end of the rod 28 to the valve 24 may be the same as that used to connect said valve to the screw 36.

Those skilled in the art will recognize that the mechanism described may be' used for various purposes and in numerous environments and changes may be made without departing from the spirit of the invention.

What Iclaim and desire to secure by Letters Patent is:

1. A gas mixing apparatus including a casing, a plurality of gas feed conduits connected to the casing, a mixture outlet connected to the casing, a valve controlling the quantity of gas passing from each of the gas feed conduits to the casing and also the gas mixture from the casing to the outlet conduit, and pressure-responsive means 0 erable by differential pressure in certain 0 said con-' duits for shifting said valve.

2. A constant proportioning gas mixing apparatus, including a casing, a plurality of conduits for feeding gases to the casing, an outlet conduit for discharging the gas mixture from the casing, a valve structure in the casing for controlling the quantity of gas fed from each of the gas feed conduits to the gas outlet conduit, pressure responsive means operable by differential pressure in certain of said conduits for shifting said valve, said pressure responsive means comprising chambers separated by a movable element, passageways connecting said.chambers to the last mentioned conduits, and other pressure responsive means operable by differential pressures in some of said conduits for varying the quantity of gas fed through one of said conduits.

3. A constant proportioning mixing apparatus including the casing, a plurality of gas feeding conduits communicating with the casing, a mixed gas outlet conduit communieating with the casing, a valve structure in the casing for controlling the quantities of gas passed from each of the gas feeding conduits to the mixture outlet conduit, pressure responsive means operable by differential pressures in certain of said conduits for shifting the valve, and manually controlled means for shifting the valve.

4. A constant proportioning gas mixing apparatus, including a casing, a plurality of gas conduits for feeding gas to the casing, a mixed gas outlet conduit also communicating with the casing, a valve structure in the casing for controlling the quantities of gases passed from the gas feeding conduits to the mixed gas outlet conduit, pressure responsive means operable by differential pressures in certain of said conduits for shifting said valve structure, pressure responsive means operable by differential pressures in certain of said conduits for varying the quantity of gas passed through one of said conduits, and manumotive means for shifting the first mentioned valve structure.

5. A constant proportioning gas mixing mechanism, including a casing, a gas feeding conduit communicating with the casing at one point, a passageway placing another point of the casing in communication with said C011". duit, a second gas feed conduit communicating with the casing, a mixed gas outlet conduit communicating with the casing, a valve structure in the casing for controlling the passage of gases through the casing, said valve structure being so arranged as to operate sure responsive means operable by difierenv tial pressures in certain of said gas conduits for shifting said valve structure, and pressure responsive means operable by differential pressures in certain of said conduits for varying the quantity of gas fed to the casing through one of said conduits.

6. A constant roportioning gas mixing mechanism, inclu in a casing, conduits for feeding a plurality 'o gases to. the casing and for discharging mixed gases from the casing,

' and means connecting the threaded stem to the valve structure, said lastmentioned means permitting movements of. the valve structure at an angle to the threaded stem.

7. A constant proportioning gas mixing apparatus, including a casing, a plurality of gas feeding conduits and a gas mixture outlet conduit connected to the bottom of the casing, an inverted cupped shaped valve slideably mounted on the bottom of the casing and havinga marginal flange adapted to control the passage of gases from the feeding conduits into the casing, pressure responsive means operable by difl'erential pressures in certain of said conduits for shifting said valve, and pressure responsive means operable by differential pressures in certain of said conduits for varying the quantity of the gas passed through one of said feed conduits.

8. A constant proportioning gas mixing apparatus, includlng a casing, a plurality of conduits for feeding gases to said casing, a conduit for discharging mixed gas from the casing, a valve in the casing for controlling the quantities of gases passed from'each of V the feed conduits into'the casing, a closed chamber, a diaphragm dividing the chamber into two gas-tight compartments, means operatively connecting the diaphragm to said valve, the diaphragm being operable by differential pressures in certain of said conduits for shifting the valve, assageways placing the last mentioned con nits in communication with said chambers, and a diaphragm controlled valve 0 erable by difierential pressures incertain 0? A the amount of gas fed through one of sai conduits.

9. A gas mixing apparatus, including a. casing, a plurality of gas feed conduits connected to the casing, a mixture. outlet connected to the casing, a valve controlling the quantity of gas passing from each of the gas feed conduits to the casing, and also the gasfrom the casing to the mixture outlet, and

pressure responsive means operable by difierential pressures in one of said conduits and said mixture outlet for shifting said valve.

10. A gas mixing apparatus including a casing, a plurality of gas feed conduits connected to the casing, a mixture outlet connected to the casing, a valve controlling the uantity of gas passing from each of the gas eed conduits to the casing and. also the gas saidconduits for varying mixture from the casing to the outlet conduit,

pressure responsive means operable b differential pressure in certain of said con uits for shifting said valve, said pressure responsive means comprising chambers separated by a movable element, and passageways connecting said chambers to the last mentioned condultsr ROSSWELL. W. THOMAS. 

